* {
  padding: 0;
  margin: 0;
  list-style: none;
  text-decoration: none;
}

.box {
  margin: 0 auto;
  width: 500px;
  height: 200px;
}

.box > .img_box {
  position: relative;
}
.box > .img_box > ul {
  position: relative;
  height: 165px;
}
.box > .img_box > ul > li {
  position: absolute;
  bottom: 20px;
  width: 400px;
  border: 2px solid #000;
  border-radius: 10px;
  overflow: hidden;
  box-sizing: border-box;
  transition: 0.3s ease-in-out;
}
/* 设置每一张图片的偏移值 */
.box > .img_box > ul > .list01 {
  transform: translateX(0) scale(0.8);
  z-index: 1;
  transform-origin: left center;
}
.box > .img_box > ul > .list02 {
  transform: translateX(50px) scale(1);
  z-index: 3;
}
.box > .img_box > ul > .list03 {
  /* 
  img_w : 400 * 0.8 = 320 
  img_offL: 500 - img_w = 180
  */
  transform: translateX(180px) scale(0.8);
  z-index: 1;
  transform-origin: left center;
}
.box > .img_box > ul > .list04 {
  transform: translateX(100px) scale(0.8);
  transform-origin: left center;
}

.box > .img_box > ul > li img {
  display: block;
  width: 100%;
}

.box > .img_box > .l_btn,
.box > .img_box > .r_btn {
  position: absolute;
  top: 50%;
  width: 30px;
  height: 50px;
  background-color: rgba(0, 0, 0, 0.5);
  transform: translateY(-50%);
  z-index: 99999;
  text-align: center;
  line-height: 40px;
  font-size: 30px;
  color: #bababa;
  cursor: pointer;
  border: 2px solid #000;
  border-radius: 10px;
  box-sizing: border-box;
}
.box > .img_box > .l_btn:hover,
.box > .img_box > .r_btn:hover {
  color: #fff;
}
.box > .img_box > .l_btn {
  left: 5px;
}
.box > .img_box > .r_btn {
  right: 5px;
}

.box > .dot_box {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 50px;
}

.box > .dot_box > span {
  width: 25px;
  height: 4px;
  background-color: #fff;
  margin: 0 5px;
  cursor: pointer;
  border: 1px solid #000;
  box-sizing: border-box;
}
.box > .dot_box > span:hover {
  background-color: #f00;
}

.box > .dot_box > .dot_active {
  background-color: #f00;
  border: 1px solid #5b5b5b;
}
